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Mercedes-Benz M112 specs: 3.7L (227 ci) 6-cylinder, 97 x 84 mm (3.8189 x 3.3071 in) bore and stroke, 10:1 compression. Built 2006.
The Mercedes-Benz M112 is oversquare — the 3.8189" bore exceeds the 3.3071" stroke by 15.5% — a layout that favors airflow and RPM over leverage at the crank. The 3.3071" stroke does not reach 4,000 ft/min of mean piston speed until about 7,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 37.8 ci (620 cc).
10:1 is in the range that usually runs on pump premium.
| Displacement | 227 ci / 3.7 L |
|---|---|
| Bore | 3.8189" |
| Stroke | 3.3071" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10:1 * |
| Bore/stroke ratio | 1.155 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 2006 |
| Bore/stroke character | 1.155 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,307 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.8 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 2006. Each year opens that model's engine table.